She succeeded to the titles of Countess Roberts and Viscountess St. Pierre on 14 November 1914.

As Earl Roberts' sons had predeceased him, the earldom was allowed to pass down the female line.

She was invested as a Dame Commander of the Order of the British Empire (DBE)[2] in 1918 for her services as Honorary Secretary, Officers' Families Fund and founder of the Countess Roberts Field Glass Fund.

[4] She was succeeded as 3rd Countess Roberts by her younger sister, Ada Edwina Stewart Roberts[5] (28 March 1875 – 21 February 1955), who married Major Henry Lewin (1872–1946).

The 3rd Countess, like her father before her, would live to see the death of her own son, and only child, Lieutenant Frederick Roberts Alexander Lewin (18 January 1915 – May 1940), who was killed in action during the Second World War.